Hubungan Diameter Selubung Saraf Optik terhadap Tekanan Intrakranial Pascabedah Kraniotomi Pasien Cedera Otak Traumatik di Intensivecareunit ICU Rumah Sakit Umum Dr. Zainoel Abidin = Correlation Optic Nerve Sheart Diameter with Intracranial Pressure in Post Craniotomy Surgery Patient with Traumatic Brain Injury at Dr. Zainoel Abidin General Hospital